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Low-avidity recognition by CD4+ T cells directed to self-antigens
John A Gebe1, Ben A Falk, Kellee A Rock
1Benaroya Research Institute at Virginia Mason, Seattle, Washington 98101, USA. jgebe@vmresearch.org
European Journal of Immunology
|May 6, 2003
Summary
Self-reactive T cells show low avidity for self-peptides, unlike non-self peptides. This low avidity recognition of self-peptides may characterize CD4(+) T cells responding to autoantigens in autoimmunity.
Area of Science:
- Immunology
- Autoimmunity Research
- T cell Biology
Background:
- Self-reactive T cells are a potential source of autoreactive cells.
- HLA-DR4, a class II molecule, is linked to autoimmune diseases.
- Understanding T cell avidity is crucial for autoimmunity research.
Purpose of the Study:
- To investigate the avidity of T cell recognition for self and non-self peptides presented by HLA-DR4.
- To compare structural and functional avidity of T cells responding to autoantigens versus foreign antigens.
Main Methods:
- Immunization of HLA-DR4 transgenic mice with self and non-self peptides.
- Measurement of T cell structural avidity using MHC class II tetramer binding.
- Generation of T cell hybridomas and assessment of functional avidity via proliferation assays.
Main Results:
- T cells recognizing non-self antigens showed high structural and functional avidity.
- T cells specific for the self-peptide hGAD65 (552-572) exhibited low structural and functional avidity.
- Low avidity recognition was observed for self-peptide epitopes by CD4(+) T cells.
Conclusions:
- CD4(+) T cells responding to autoantigens may predominantly exhibit low avidity recognition of self-peptide epitopes.
- This finding contributes to understanding the mechanisms of autoimmunity.
- The study highlights differences in T cell avidity between self and non-self antigen recognition.